Another directory totally cleaned out

src/include/storage/backendid.h

src/include/storage/buf_internals.h

src/include/storage/bufmgr.h

src/include/storage/bufpage.h

src/include/storage/itempos.h

src/include/storage/large_object.h

src/include/storage/lmgr.h

src/include/storage/lock.h

src/include/storage/multilev.h

src/include/storage/pagenum.h

src/include/storage/proc.h

src/include/storage/shmem.h

src/include/storage/sinval.h

src/include/storage/sinvaladt.h

src/include/storage/smgr.h

src/include/storage/spin.h